Which version?

I've written three versions of a function which returns the lower case of an upper case alpha char passed to it. If it is passed a char which is not an upper case alpha it returns the input unmodified. All three versions have been tested.

Comments

All 3 ways seem to be okay; some just taking up more memory than others. Why not use the [color=Green][b]lowercase[/b][/color] function that is in the [color=Purple][b]System[/b][/color] unit of Free Pascal 2.6.0?

: All 3 ways seem to be okay; some just taking up more memory than : others. Why not use the [color=Green][b]lowercase[/b][/color] : function that is in the [color=Purple][b]System[/b][/color] unit of : Free Pascal 2.6.0?: I'm not using Free Pascal. I'm using Turbo Pascal 7.0